Trapdoor

Deck hatch of the Omega, the last square-rigged sailing cargo ship

Amtrak conductors standing in the doorways of Amfleet cars with their trapdoors in the closed (above) and open (below) positions

An Amtrak conductor standing in the doorway of an Amfleet cars with its trapdoor in the open position

A trapdoor is a sliding or hinged door, flush with the surface of a floor, roof, or ceiling, or in the stage of a theatre. A hatch, an opening which may also be in a wall and need not be flush with the surface, is similar; in some cases either name is applicable. A small door in a wall, floor or ceiling used to gain access to equipment is called an access hatch or access door.

单词	Hatch door
释义	Hatch door 英语百科 Trapdoor A trapdoor is a sliding or hinged door, flush with the surface of a floor, roof, or ceiling, or in the stage of a theatre. A hatch, an opening which may also be in a wall and need not be flush with the surface, is similar; in some cases either name is applicable. A small door in a wall, floor or ceiling used to gain access to equipment is called an access hatch or access door.
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Hatch door

Trapdoor